Anamorphic photography for digital imagers

ABSTRACT

A digital camera comprising a digital image sensor and at least one corrective lens element configured to reduce a blurring of an image in a horizontal or vertical dimension on the digital image sensor. Preferably the digital image sensor is a large digital imager such as a Digital 65 imager.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/275,733, filed Jan. 6, 2016, the entire contents of which areincorporated herein by reference.

BACKGROUND

Anamorphic camera systems have been utilized to capture a widescreenaspect ratio on film that has a smaller aspect ratio, such as standard35 mm film. For example, in the standard Panavision anamorphic system, awidescreen image having an aspect ratio of 2.4:1 is compressed in ahorizontal dimension by a factor of 2, to be captured on 35 mm film atan aspect ratio of 1.2:1. The horizontal compression allows a higherresolution image to be stored on 35 mm film than would otherwise beallowed if a 2.4:1 aspect ratio were stored on 35 mm film. Anamorphiclens elements are used to compress the original image to be stored onfilm, and are then used to expand the image again for projection in acinema or the like.

With the expanded use of digital camera systems, further developments toanamorphic systems are required to address the needs of such digitalcamera systems. In addition, modifications to the anamorphic compressionratio are needed to address the aspect ratios utilized by digitalimaging sensors.

SUMMARY

The systems, apparatuses, and methods disclosed herein are intended toprovide for improved anamorphic systems for use with digital camerasystems. In addition, modifications to the anamorphic compression ratiodisclosed herein address the aspect ratios provided by digital imagingsensors.

In one embodiment, the application discloses a digital camera comprisinga digital image sensor and a lens group positioned along an opticalaxis. The lens group includes at least one anamorphic lens elementconfigured to compress an image in a horizontal or vertical dimension;at least one powered lens element positioned between the at least oneanamorphic lens element and the digital image sensor; and at least onecorrective lens element positioned between the at least one powered lenselement and the digital image sensor, and configured to reduce ablurring of the image in the horizontal or vertical dimension on thedigital image sensor or decomposition the image in the horizontal orvertical dimension to substantially equalize the image quality in thehorizontal and vertical dimension.

In one embodiment, the application discloses a digital camera systemcomprising a digital image sensor including an optical low pass filter.The system includes at least one anamorphic lens element configured tocompress an image in a horizontal or vertical dimension. The systemincludes at least one corrective lens element configured to bepositioned along an optical axis between the at least one anamorphiclens element and the optical low pass filter, and configured to reduce ablurring of the image in the horizontal or vertical dimension on thedigital image sensor caused by the optical low-pass filter.

In one embodiment, the application discloses a digital camera systemcomprising at least one anamorphic lens element configured to compressan image in a horizontal or vertical dimension by a squeeze ratio ofapproximately 1.29. The system includes a digital image sensorconfigured to receive the image compressed by the at least oneanamorphic lens element.

BRIEF DESCRIPTION OF THE DRAWINGS

Features and advantages of the systems, apparatuses, and methods asdisclosed herein will become appreciated as the same become betterunderstood with reference to the specification, claims, and appendeddrawings wherein:

FIG. 1 illustrates a schematic view of a camera capturing an image of anobject on film.

FIG. 2 illustrates a diagram of blurring using a spherical lens element.

FIG. 3 illustrates a diagram of blurring using an anamorphic lenselement.

FIG. 4 illustrates a diagram of a representation of a modulationtransfer function (MTF).

FIG. 5 illustrates a schematic view of a camera capturing an image of anobject on film, according to an embodiment of the present disclosure.

FIG. 6 illustrates a schematic view of at least one corrective lenselement, according to embodiments of the present disclosure.

FIG. 7 illustrates a diagram of optics of a digital camera, according toan embodiment of the present disclosure.

FIG. 8 illustrates a diagram of use of a 1.29 squeeze ratio, accordingto an embodiment of the present disclosure.

DETAILED DESCRIPTION

FIG. 1 illustrates a schematic view of a camera 10 utilizing ananamorphic process to capture an image of an object 12 on film 14.Anamorphic processes have been used in film applications, namely inmotion picture and television filming, to provide a widescreen imagecapture, yet also enhance the use of the imaging area of a film. Ananamorphic process includes compressing the image in a horizontaldimension, or a vertical dimension, to reduce the aspect ratio of theimage as it is stored on film. During the projection of the imaged filmat a later time, a reverse process is used to expand the image in thehorizontal or vertical dimension, to reproduce the original uncompressedimage.

An anamorphic process has been used to capture images on 65 millimeter(mm) film in a system referred to as Ultra Panavision. The UltraPanavision system includes a camera 10 having an anamorphic lens group16, a powered lens group 18, and 65 mm film 14 for storing the images.The anamorphic lens group 16 includes a plurality of anamorphic lenselements 22. The anamorphic lens elements 22 are configured to compressthe image in a dimension, which may be a horizontal or verticaldimension, by a squeeze ratio of between 1.19 to 1.30, which may includea ratio of 1.25, or 1.255. The squeeze ratio is the ratio of theuncompressed image aspect ratio to the compressed image aspect ratio.The anamorphic lens elements 22 may comprise a weak negative afocalsystem. The anamorphic lens elements 22 may comprise cylindrical lenselements, and/or prism lens elements to produce the compression in thehorizontal or vertical dimension. The anamorphic lens elements 22 mayinclude an astigmatizer, which may be similar to the variableastigmatizer disclosed in Wallin, Anamorphosing System, U.S. Pat. No.2,890,622, issued Jun. 16, 1959, the entire contents of which areincorporated herein by reference. The variable astigmatizer may utilizeweak counter-rotating cylinders (e.g., one positive and one negative, orboth positive, or both negative) that balance out the axial focusposition of the powered and non-powered axes when effectuating focus.

The powered lens group 18 may include spherical lens elements 24 thatconverge and/or diverge the afocal image produced by the anamorphic lensgroup 16. The powered lens group 18 may be utilized to effectuate focusof the image. The powered lens group 18 may operate in a similar mannerand include similar elements as the focusing lens disclosed in Wallin,U.S. Pat. No. 2,890,622. The powered lens group 18 may be positionedalong an optical axis 26 between the anamorphic lens group 16 and thefilm 14.

The 65 mm film 14 includes an imaging area having a width in ahorizontal or vertical dimension of approximately 48.62 mm, and a heightin a respective corresponding vertical or horizontal dimension ofapproximately 22.10 mm. The aspect ratio of the film 14 is approximately2.20:1. The squeeze ratio of 1.25, or 1.255, allows the system tocapture an image with an aspect ratio of approximately 2.76:1 on filmhaving an aspect ratio of 2.20:1. The original widescreen aspect ratioof 2.76:1 is reproduced during projection of the imaged film at a latertime. The image quality of the 65 mm film, in combination with the2.76:1 widescreen aspect ratio, provides an enhanced viewing experiencerelative to standard widescreen images seen at most cinemas.

An anamorphic process used with digital cameras, and particularly largeformat digital cameras, has been found to produce problems not typicallyfound with normal film emulsion capture. The use of a digital imagesensor in digital cameras produces undesired blurring of the image,particularly in the dimension of anamorphic compression. Digital imagesensors may include an optical low-pass filter having supporting filtersthat the chief ray and associated bundle must pass through, causing anovercorrection/under correction of the normal image correction providedby the camera optics. The filter pack within the camera may overcorrectaxial aberrations and undercorrect transverse aberrations. The blurringin the horizontal dimension may include spherical aberration, coma, andastigmatism.

FIG. 2 illustrates a diagram of the blurring occurring in a digitalcamera using a spherical lens element 28. The spherical lens element 28compresses the original image, however, any blurring is uniformthroughout the image as it is imaged on the digital image sensor.

FIG. 3 illustrates a diagram of the blurring occurring in a digitalcamera using an anamorphic lens element 30, namely a cylindrical lenselement, configured to compress the image in a horizontal or verticaldimension 32. The elements of the digital image sensor produce enhancedblurring of the image in the horizontal or vertical dimension ofanamorphic compression.

The digital image sensor may include an optical low-pass filter that mayinclude and that is not limited to a birefringent material. The opticallow pass filter is unique to digital cameras, because unlike filmcameras the image gets divided up into pixels on the image sensor. Theoptical low pass filter specifically prevents any spatial frequenciesnot resolvable by the pixels on the sensor, which is essential toprevent common digital image artifacts. The birefringent material, incombination with the disproportionate magnification in the dimension ofanamorphic compression of the image, may result in a modulation transferfunction (MTF) of the dimension of anamorphic compression compared tothe orthogonal vertical or horizontal dimension that is reduced by afactor of the squeeze ratio. FIG. 4 illustrates an exemplary MTF in adimension without anamorphic compression, which would be lesser in thedimension of anamorphic compression. Accordingly, the image is blurredin the dimension of anamorphic compression on the digital image sensorto a greater amount than the blurring in the corresponding orthogonalvertical or horizontal dimension. In an embodiment in which theanamorphic compression is in the horizontal dimension, the resultingimage is not as sharp horizontally as it is vertically.

FIG. 5 illustrates an embodiment of a digital camera designed to addressthe blurring in the dimension of anamorphic compression produced by thedigital image sensor 38. The digital camera 36 may include the digitalimage sensor 38, an anamorphic lens group 16, a powered lens group 18,and a corrective lens group 40.

The digital image sensor 38 may include an active imaging area 42 and anoptical low-pass filter 44. In one embodiment, the digital image sensor38 may be configured as a digital sensor with greater than about 2Kresolution, and in an example embodiment is a 4K resolution digitalsensor, although in other embodiments lesser (2k) or greater resolution(e.g., greater than 4K) may be utilized as desired. In one embodiment,the digital image sensor 38 may have a Digital 65 format. The digitalcamera 36 may allow for the optics of a film camera to be applied to adigital image sensor 38. The optics of the digital camera 36 may capturean image having a size of approximately 48.62 mm by 22.1 mm, as with 65mm film, yet at a 4k digital resolution.

In one embodiment, the digital image sensor 38 may be configured to havean active imaging area 42 that is approximately equal to the 48.62 mm by22.1 mm format of 65 mm film, or greater in area than the format of 65mm film. In one embodiment, the digital image sensor 38 may beconfigured to have an active imaging area with a width along thehorizontal or vertical dimension that is greater than 35 mm. In oneembodiment, the digital image sensor 38 may be configured to have anactive imaging area with a width along the horizontal or verticaldimension that is greater than 50 mm. In one embodiment, the digitalimage sensor 38 may be configured to have an active imaging area with awidth along the horizontal or vertical dimension that is betweenapproximately 50 mm and 70 mm.

In one embodiment, the digital image sensor 38 may be configured to havean active imaging area with a height along the vertical or horizontaldimension that is greater than about 20 mm. In one embodiment, thedigital image sensor 38 may be configured to have an active imaging areawith a height along the vertical or horizontal dimension that is greaterthan about 30 mm. In one embodiment, the digital image sensor 38 may beconfigured to have an active imaging area with a height along thevertical or horizontal dimension that is between approximately 25 mm and35 mm. In one embodiment, the digital image sensor 38 may be configuredto have an aspect ratio of approximately 2.2:1. In one embodiment, theheights and widths of the digital image sensor 38 may be combined orvaried to different aspect ratios as desired. Preferably, large formatdigital image sensors 38 are utilized, however, in other embodiments,other formats of digital image sensors 38 may be used as desired. Theoptical low-pass filter 44 may comprise a single layer or type ofmaterial, or multiple layers or types of material.

The anamorphic lens group 16 may be configured similarly as theanamorphic lens group 16 discussed in regard to FIG. 1. The anamorphiclens group 16 may include a plurality of anamorphic lens elements, ormay include at least one anamorphic lens element 22. The at least oneanamorphic lens element 22 may be configured to compress an image in thehorizontal or vertical dimension. The anamorphic lens group 16 may beconfigured be integral with the remainder of the lens group, or may beconfigured to be detachable. In an embodiment in which the lens group 16is detachable, the digital camera 36 may be configured to alter betweenanamorphic capture modes and non-anamorphic capture modes.

The powered lens group 18 may be configured similarly as the poweredlens group 18 discussed in regard to FIG. 1. The powered lens group 18may include a plurality of powered lens elements 24, or may include atleast one powered lens element 24. The powered lens elements 24 mayinclude spherical lens elements. The spherical lens elements may beconfigured to vary the magnification of the image from the anamorphiclens group 16 in all dimensions. The powered lens group 18 may bepositioned between the at least one anamorphic lens element 22 and thedigital image sensor 38. The powered lens group 18 may be configured beintegral with the remainder of the lens group, or may be configured tobe detachable.

The corrective lens group 40 may be positioned between the powered lensgroup 18 and the digital image sensor 38. The corrective lens group 40may include at least one corrective lens element 48 that is configuredto reduce a blurring of the image in the dimension of anamorphiccompression on the digital image sensor 38, or configured todecomposition the image in the corresponding orthogonal horizontal orvertical dimension to bring the performance in the dimension ofanamorphic compression and the corresponding orthogonal horizontal orvertical dimension to unity, or to substantially equalize the imagequality in the two orthogonal dimensions. The reduction of blurring mayaccount for the preferred large format of the digital image sensor 38.The corrective lens group 40 may be positioned as an image side lensgroup relative to the anamorphic lens group 16, and may serve as a rearoptic group comprising the last set of optics prior to the digital imagesensor 38. The corrective lens group 40 may be configured to be integralwith the remainder of the lens group, or may be configured to bedetachable. In an embodiment in which the lens group 16 and correctivelens group 40 are detachable, the digital camera 36 may be configured toalter between anamorphic capture modes and non-anamorphic capture modes.

The at least one corrective lens element 48 may comprise a weakcompensator that serves to equalize the asymmetrical blurring caused bythe digital image sensor 38, which may include the blurring caused bythe optical low-pass filter 44. In one embodiment, the at least onecorrective lens element 48 may comprise a cylindrical lens element,which may be a toroidal lens element. The at least one corrective lenselement 48 may be self-contained and self-cancelling, yet provide acylindrical power. The cylindrical lens element may be configured tooffset the disproportionate convolution of the image MTF between thedimension of anamorphic compression and the corresponding orthogonalhorizontal or vertical dimension when imaged through a birefringentoptical low-pass filter 44. In one embodiment, the power of thecylindrical lens element may be dependent on the power provided by theat least one anamorphic lens element 22. Front and rear cylindricalgroups may be dependent on each other for optical corrections at thedesired large format. As such, the at least one corrective lens element48 may operate in combination with, and may be dependent on, the atleast one anamorphic lens element 22. The rear cylindrical lens elementmay be configured to correct the spherical aberration, coma, fieldcurvature, and astigmatism caused by the optical low-pass filter 44.

In one embodiment, the at least one corrective lens element 48 maycomprise a birefringent material. The birefringent material may have anorientation within the corrective lens group 40 that serves to reducethe asymmetrical blurring caused by the digital image sensor 38, whichmay include the blurring caused by the optical low-pass filter 44. Thebirefringent material may be configured to balance out the asymmetricalblurring by providing a calculated amount of image decomposition, whichmay be a function of the squeeze ratio. A single layer or type ofbirefringent material, or multiple layers or types of birefringentmaterial may be utilized as desired. The birefringent material may beconfigured to correct the spherical aberration, coma, field curvature,and astigmatism caused by the optical low-pass filter 44.

In one embodiment, the at least one corrective lens element 48 mayinclude a combination of a cylindrical lens element, such as a toroidallens element, and a birefringent material. In one embodiment, thecorrective lens group 40 may be configured as a group of adaptive opticspositioned on the image side of the anamorphic lens group 16. In oneembodiment, the anamorphic lens group 16 may be configured as acylindrical lens group that operates in combination with the adaptiveoptics of the corrective lens group 40.

FIG. 6 illustrates an embodiment of the at least one corrective lenselement 48 comprising a birefringent material 48 a. The birefringentmaterial in one embodiment may comprise quartz, although in otherembodiments, a different material may be utilized as desired. Thebirefringent material may be oriented orthogonal to the powereddimension. FIG. 6 illustrates an embodiment of the at least onecorrective lens element 48 comprising a cylindrical lens element, whichmay be a toroidal lens element 48 b. The toroidal lens element maycomprise a weak toroidal surface facing the object side of thecorrective lens group 40.

FIG. 7 illustrates a top view of the optics of the digital camera 36before and after correction by the at least one corrective lens element48. Blurring in the dimension of anamorphic compression is reduced.

The anamorphic lens group 16, the powered lens group 18, and thecorrective lens group 40 may in combination comprise a lens group thatis positioned along an optical axis 26. The anamorphic lens group 16,and the corrective lens group 40 may operate on front and rear sides ofthe powered lens group 18.

In one embodiment, the squeeze ratio of the anamorphic lens group 16 maybe 2, for example in an embodiment in which the standard 2.4:1Panavision widescreen aspect ratio is desired (for a captured 1.2:1aspect ratio). In one embodiment, the squeeze ratio of the anamorphiclens group 16 may be set to approximately 1.34, for example in anembodiment in which a captured 1.78 aspect ratio is desired, in a mannerdescribed in Miyagishima et al., Anamorphic Three-Perforation ImagingSystem, U.S. Pat. No. 7,148,947, issued Dec. 12, 2006, the entirecontents of which are incorporated herein by reference. In oneembodiment, the squeeze ratio of the anamorphic lens group 16 may bevaried as desired.

Referring to FIG. 8, in one embodiment, the squeeze ratio of theanamorphic lens group 16 a may be varied by about 3% of 1.25, or 1.255,to provide an anamorphic lens group 16 b having a squeeze ratio ofapproximately 1.29. In one embodiment, the 3% adjustment may be achievedby introducing or enhancing the size of an air gap between the frontelement of the anamorphic lens group 16 b and the astigmatizers.

The 1.29 squeeze ratio may be utilized with both a Digital 65 digitalimage sensor, as well as a Super 35 digital image sensor. In anembodiment in which a Digital 65 digital image sensor is used, thechange in compression ratio may be essentially negligible as it iswithin the compression ratio tolerances that already exist in theanamorphic lens group 16 b, for example within the astigmatizers.Accordingly, a 2.76:1 aspect ratio may still result upon expansion.

In an embodiment in which a Super 35 digital image sensor is used, the1.29 squeeze ratio allows a 2.4:1 image to be captured at a 1.78:1aspect ratio, with only an approximately 4% loss of use of the activeimage area. The entire width of the sensor may be used, which allows fora true 4k resolution hybrid 2.4:1 aspect ratio anamorphic scan. This maybe an improvement over traditional anamorphic capture at a squeeze ratioof 2, which is currently limited to a 2k resolution.

The captured 1.78 aspect ratio (Super 35), or the captured 2.20 aspectratio (Digital 65) may be converted to alternative desired aspect ratiosin the manner described in Miyagishima et al., U.S. Pat. No. 7,148,947.

The processes disclosed herein of capturing an image at a squeeze ratiomay be practiced as a method within the scope of this application. Inaddition, use of the at least one corrective lens element 48 disclosedherein may be practiced as a method within the scope of thisapplication. Other methods disclosed herein may be practiced within thescope of this application. In addition, the at least one corrective lenselement 48, separate or in combination with other of the opticsdisclosed herein may comprise a standalone feature within the scope ofthis application.

In closing, it is to be understood that although aspects of the presentspecification are highlighted by referring to specific embodiments, oneskilled in the art will readily appreciate that these disclosedembodiments are only illustrative of the principles of the subjectmatter disclosed herein. Therefore, it should be understood that thedisclosed subject matter is in no way limited to a particularmethodology, protocol, and/or reagent, etc., described herein. As such,various modifications or changes to or alternative configurations of thedisclosed subject matter can be made in accordance with the teachingsherein without departing from the spirit of the present specification.Lastly, the terminology used herein is for the purpose of describingparticular embodiments only, and is not intended to limit the scope ofsystems, apparatuses, and methods as disclosed herein, which is definedsolely by the claims. Accordingly, the systems, apparatuses, and methodsare not limited to that precisely as shown and described.

Certain embodiments of systems, apparatuses, and methods are describedherein, including the best mode known to the inventors for carrying outthe same. Of course, variations on these described embodiments willbecome apparent to those of ordinary skill in the art upon reading theforegoing description. The inventor expects skilled artisans to employsuch variations as appropriate, and the inventors intend for thesystems, apparatuses, and methods to be practiced otherwise thanspecifically described herein. Accordingly, the systems, apparatuses,and methods include all modifications and equivalents of the subjectmatter recited in the claims appended hereto as permitted by applicablelaw. Moreover, any combination of the above-described embodiments in allpossible variations thereof is encompassed by the systems, apparatuses,and methods unless otherwise indicated herein or otherwise clearlycontradicted by context.

Groupings of alternative embodiments, elements, or steps of the systems,apparatuses, and methods are not to be construed as limitations. Eachgroup member may be referred to and claimed individually or in anycombination with other group members disclosed herein. It is anticipatedthat one or more members of a group may be included in, or deleted from,a group for reasons of convenience and/or patentability. When any suchinclusion or deletion occurs, the specification is deemed to contain thegroup as modified thus fulfilling the written description of all Markushgroups used in the appended claims.

Unless otherwise indicated, all numbers expressing a characteristic,item, quantity, parameter, property, term, and so forth used in thepresent specification and claims are to be understood as being modifiedin all instances by the term “about.” As used herein, the term “about”means that the characteristic, item, quantity, parameter, property, orterm so qualified encompasses an approximation that may vary. The terms“approximate[ly]” and “substantial[ly]” represent an amount that mayvary from the stated amount, yet is capable of performing the desiredoperation or process discussed herein.

The terms “a,” “an,” “the” and similar referents used in the context ofdescribing the systems, apparatuses, and methods (especially in thecontext of the following claims) are to be construed to cover both thesingular and the plural, unless otherwise indicated herein or clearlycontradicted by context. All methods described herein can be performedin any suitable order unless otherwise indicated herein or otherwiseclearly contradicted by context. The use of any and all examples, orexemplary language (e.g., “such as”) provided herein is intended merelyto better illuminate the systems, apparatuses, and methods and does notpose a limitation on the scope of the systems, apparatuses, and methodsotherwise claimed. No language in the present specification should beconstrued as indicating any non-claimed element essential to thepractice of the systems, apparatuses, and methods.

All patents, patent publications, and other publications referenced andidentified in the present specification are individually and expresslyincorporated herein by reference in their entirety for the purpose ofdescribing and disclosing, for example, the compositions andmethodologies described in such publications that might be used inconnection with the systems, apparatuses, and methods. Thesepublications are provided solely for their disclosure prior to thefiling date of the present application. Nothing in this regard should beconstrued as an admission that the inventors are not entitled toantedate such disclosure by virtue of prior invention or for any otherreason. All statements as to the date or representation as to thecontents of these documents is based on the information available to theapplicants and does not constitute any admission as to the correctnessof the dates or contents of these documents.

What is claimed is:
 1. A digital camera comprising: a digital imagesensor; a lens group positioned along an optical axis and including: atleast one anamorphic lens element configured to compress an image in ahorizontal or vertical dimension; at least one powered lens elementpositioned between the at least one anamorphic lens element and thedigital image sensor; and at least one corrective lens elementpositioned between the at least one powered lens element and the digitalimage sensor, and configured to reduce a blurring of the image in thehorizontal or vertical dimension on the digital image sensor ordecomposition the image in the horizontal or vertical dimension tosubstantially equalize the image quality in the horizontal and verticaldimension.
 2. The digital camera of claim 1, wherein the at least onecorrective lens element includes at least one toroidal lens element. 3.The digital camera of claim 1, wherein the at least one corrective lenselement includes at least one birefringent material.
 4. The digitalcamera of claim 1, wherein the digital image sensor has an activeimaging area with a width along the horizontal or vertical dimensionthat is greater than about 35 millimeters.
 5. The digital camera ofclaim 4, wherein the digital image sensor has an active imaging areawith a height that is greater than about 20 millimeters.
 6. The digitalcamera of claim 1, wherein the digital image sensor includes an opticallow-pass filter, the at least one corrective lens element beingconfigured to reduce a blurring of the image in the horizontal orvertical dimension on the digital image sensor caused by the opticallow-pass filter.
 7. The digital camera of claim 1, wherein the at leastone anamorphic lens element is configured to compress the image in thehorizontal or vertical dimension by a squeeze ratio of approximately1.29.
 8. The digital camera of claim 1, wherein the at least onecorrective lens element includes a combination of at least one toroidallens element and at least one birefringent material.
 9. The digitalcamera of claim 1, wherein the at least one anamorphic lens element isconfigured to detach from the at least one powered lens element.
 10. Thedigital camera of claim 1, wherein the digital camera is configured toalter between an anamorphic capture mode and a non-anamorphic capturemode.
 11. A digital camera system comprising: a digital image sensorincluding an optical low pass filter; at least one anamorphic lenselement configured to compress an image in a horizontal or verticaldimension; and at least one corrective lens element configured to bepositioned along an optical axis between the at least one anamorphiclens element and the optical low pass filter, and configured to reduce ablurring of the image in the horizontal or vertical dimension on thedigital image sensor caused by the optical low-pass filter.
 12. Thedigital camera system of claim 11, wherein the at least one correctivelens element is configured to correct one or more of a sphericalaberration, a coma, a field curvature, or an astigmatism caused by theoptical low-pass filter.
 13. The digital camera system of claim 11,wherein the at least one corrective lens element includes a birefringentmaterial.
 14. The digital camera system of claim 11, wherein the atleast one corrective lens element includes at least one toroidal lenselement.
 15. The digital camera system of claim 11, wherein the at leastone anamorphic lens element is configured to compress the image in thehorizontal or vertical dimension by a squeeze ratio of approximately1.29.
 16. A digital camera system comprising: at least one anamorphiclens element configured to compress an image in a horizontal or verticaldimension by a squeeze ratio of approximately 1.29; and a digital imagesensor configured to receive the image compressed by the at least oneanamorphic lens element.
 17. The digital camera system of claim 16,wherein the digital image sensor is configured to receive the image at a1.78:1 aspect ratio.
 18. The digital camera system of claim 16, whereinthe digital image sensor is configured to receive the image at a 2.2:1aspect ratio.
 19. The digital camera system of claim 16, wherein thedigital image sensor has at least a 4K resolution.
 20. The digitalcamera system of claim 16, wherein the digital image sensor has anactive imaging area with a width along the horizontal or verticaldimension that is greater than about 35 millimeters.